I think the part is readily available online. Or 3D printable. Or included in shipments of cartel fentanyl, like a Cracker Jack prize. Between the Chinese, the cartels, and their enablers in this country, there’s a lot of latitude for law-breakers.
Oh hell yeah.. you can 3D print them all day long, a dozen at a time on the working surface. I had the STL files at one point for G19 and G17... might still have them. But I’m just not “that” interested. I have enough trouble striking targets at 20 yards in low light... and converting the damned thing into a machine gun isn’t going to help! LOL! :-)